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What format are they? I don't think the Walkman will play M4a (iPod) files. You're best-off with Mp3 files at a bit-rate of 128mbps or 192mbps. I'm not sure if it can handle "lossless" quality music files.

All the bluetooth wireless headset are only capable of making/receiving voice calls.Y? its a bluetooth software which is installed on ur cell phone. it is not capable of listing the music through the BT headset. BT 1.1 Software version only lets you listen to mono.BT 1.2, Version playing music through a BT headset while music is playing on laptops.and again we need to find out what BT software version is on the phone and if sony erricsson came out with better BT software for your needs.